NGC 6645 is an faint open cluster that merges in the populated sky background of
the constellation of Sagittarius very close to the limits with Scutum. It is
quite rich in stars although most of them are magnitude 10 to 12. It has an
irregular shape and clearly visible a strings of stars that extends out of the
cluster to the east (in the image to the left). The image cover a FOV of
approximately 45 arc minutes and north is up.

NGC 6645 was discovered by Sir William Herschel in 1786.

Although the image was taken from my light polluted backyard, the amount of
stars and information gathered by the set up was fair enough for this not so
popular object.